Key Technology Research For GBAS Operation Simulation Based On FlightGear

As a new type of local augumentation system based on satellite navigation system,GBAS can be used in the field of civil aviation to provide high-precision navigation services.In order to directly demonstrate the guiding process of GBAS in runtime,it is of great significance to apply three dimensions dynamic visual simulation.By researching the data transmission interface of FlightGear flight simulation software,a data interactive platform based on FlightGear is built,and the external data is used to simulate the 3D visual simulation while analyzing the data,and the output parameters are monitored in real time.Firstly,the significance and advantages of GBAS applied to guide the aircraft approach landing under the background of widely implementation of PBN are expressed,and the development and present application of GBAS at home and abroad,as well as domestic and foreign related researches in the field of visual simulation are briefly introduced.The key technologies of GBAS are mainly analyzed,which include carrier phase smoothing pseudorange differential positioning technology and airborne integrity monitoring technology.Secondly,according to the GPS and BDS almanacs and RINEX ephemeris obtained by the receiver,the satellite navigation sources of the terminal area which is near to Tianjin Binhai International Airport is simulated and the positioning accuracy and usability of GPS and BDS were analyzed.Then,based on the simulated satellite navigation sources,the carrier phase smoothing pseudorange differential positioning algorithm and the airborne integrity monitoring algorithm are simulated and analyzed.The simulation results show that the Ground Based Augumentation System based on GPS or BDS can meet the performance requirements of CAT I precision approach in the terminal area.Finally,the data input interface is set up under Simulink,and the joint simulation programme of Matlab/Simulink and FlightGear is realized.Set up a specific FinalApproach Segment flight plan to simulate a dynamic flight process of a flight,apply the GBAS data model and analyze the navigation performance of the airborne satellite navigation system synchronously,and the integration of 3D visual and data analysis is realized.At the same time,a monitoring software of monitoring the flight data in real time is developed to complete the entire process of the data interactive platform based on FlightGear.The simulation results show that the GBAS system based on the Beidou can support the guidance of CAT I precision approach in the terminal area.